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dechlorinators & ammonia "burst"

<< Chlorine and ammonia (e.g., chloramines) are the first things to suspect.
 Both should always test at zero in any water you add to your tank. Don't try
 to use dechlorinators (hypo, sodium thiosulphate) if your supplier has
 switched to chloramine. You *must* remove the burst of ammonium/ammonia if
 your pH ever goes much above 7.5 or they will get severe gill burns. >>

Does this mean that using a product designed to remove chlorine and 
chloramine is not sufficient? Can someone please explain this?